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sched: incremental effective_load()

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Increase the accuracy of the effective_load values.

Not only consider the current increment (as per the attempted wakeup), but
also consider the delta between when we last adjusted the shares and the
current situation.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-06-27 13:41:38 +02:00 committed by Ingo Molnar
parent 83378269a5
commit f1d239f732
2 changed files with 21 additions and 3 deletions
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6
kernel/sched.c
View file

@ -427,6 +427,11 @@ struct cfs_rq {
* this cpu's part of tg->shares
*/
unsigned long shares;
/*
* load.weight at the time we set shares
*/
unsigned long rq_weight;
#endif
#endif
};
@ -1527,6 +1532,7 @@ __update_group_shares_cpu(struct task_group *tg, int cpu,
* record the actual number of shares, not the boosted amount.
*/
tg->cfs_rq[cpu]->shares = boost ? 0 : shares;
tg->cfs_rq[cpu]->rq_weight = rq_weight;
if (shares < MIN_SHARES)
shares = MIN_SHARES;

18
kernel/sched_fair.c
View file

@ -1074,10 +1074,22 @@ static inline int wake_idle(int cpu, struct task_struct *p)
static const struct sched_class fair_sched_class;
#ifdef CONFIG_FAIR_GROUP_SCHED
static unsigned long effective_load(struct task_group *tg, int cpu,
unsigned long wl, unsigned long wg)
static long effective_load(struct task_group *tg, int cpu,
long wl, long wg)
{
struct sched_entity *se = tg->se[cpu];
long more_w;
if (!tg->parent)
return wl;
/*
* Instead of using this increment, also add the difference
* between when the shares were last updated and now.
*/
more_w = se->my_q->load.weight - se->my_q->rq_weight;
wl += more_w;
wg += more_w;
for_each_sched_entity(se) {
#define D(n) (likely(n) ? (n) : 1)
@ -1086,7 +1098,7 @@ static unsigned long effective_load(struct task_group *tg, int cpu,
S = se->my_q->tg->shares;
s = se->my_q->shares;
rw = se->my_q->load.weight;
rw = se->my_q->rq_weight;
a = S*(rw + wl);
b = S*rw + s*wg;